package com.manbu.live.common.interfaces.utils;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.Key;
import java.security.SecureRandom;

/**
 * @author hanWang
 * @Title:
 * @Package
 * @Description:
 * @date 2024/1/282:50 AM
 */
public class DESUtils {
    // 算法名称
    public static final String KEY_ALGORITHM = "DES";
    // 算法名称/加密模式/填充方式
    // DES 共有四种工作模式-->>ECB：电子密码本模式、CBC：加密分组链接模式、CFB：加密反馈模式、OFB：输出反馈模式
    public static final String CIPHER_ALGORITHM =
            "DES/ECB/PKCS5Padding";
    public static final String PUBLIC_KEY = "BAS9j2C3D4E5F60708";
    /**
     * 生成密钥 key 对象
     *
     * @param keyStr 密钥字符串
     * @return 密钥对象
     * @throws Exception
     */
    private static SecretKey keyGenerator(String keyStr) throws Exception {
        byte input[] = HexString2Bytes(keyStr);
        DESKeySpec desKey = new DESKeySpec(input);
        // 创建一个密匙工厂，然后用它把 DESKeySpec 转换成
        SecretKeyFactory keyFactory =
                SecretKeyFactory.getInstance("DES");
        SecretKey securekey = keyFactory.generateSecret(desKey);
        return securekey;
    }
    private static int parse(char c) {
        if (c >= 'a')
            return (c - 'a' + 10) & 0x0f;
        if (c >= 'A')
            return (c - 'A' + 10) & 0x0f;
        return (c - '0') & 0x0f;
    }
    // 从十六进制字符串到字节数组转换
    public static byte[] HexString2Bytes(String hexstr) {
        byte[] b = new byte[hexstr.length() / 2];
        int j = 0;
        for (int i = 0; i < b.length; i++) {
            char c0 = hexstr.charAt(j++);
            char c1 = hexstr.charAt(j++);
            b[i] = (byte) ((parse(c0) << 4) | parse(c1));
        }
        return b;
    }
    /**
     * 加密数据
     *
     * @param data 待加密数据
     * @return 加密后的数据
     */
    public static String encrypt(String data) throws Exception {
        Key deskey = keyGenerator(PUBLIC_KEY);
        // 实例化 Cipher 对象，它用于完成实际的加密操作
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        SecureRandom random = new SecureRandom();
        // 初始化 Cipher 对象，设置为加密模式
        cipher.init(Cipher.ENCRYPT_MODE, deskey, random);
        byte[] results = cipher.doFinal(data.getBytes());
        // 执行加密操作。加密后的结果通常都会用 Base64 编码进行传输
        return Base64.encodeBase64String(results);
    }
    /**
     * 解密数据
     *
     * @param data 待解密数据
     * @return 解密后的数据
     */

    public static String decrypt(String data) throws Exception {
        Key deskey = keyGenerator(PUBLIC_KEY);
        Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
        // 初始化 Cipher 对象，设置为解密模式
        cipher.init(Cipher.DECRYPT_MODE, deskey);
        // 执行解密操作
        return new
                String(cipher.doFinal(Base64.decodeBase64(data)));
    }
    public static void main(String[] args) throws Exception {
        String phone = "17818723311";
        String encryptStr = DESUtils.encrypt(phone);
        String decryStr = DESUtils.decrypt(encryptStr);
        System.out.println(encryptStr);
        System.out.println(decryStr);
    }
}